www.ti.com
2.3.3
DAC A(B) Gain
2.3.4
NCO
2.3.5
Additional Control/Monitor Registers
3
Physical Description
Physical Description
⋅
DAC Coarse Sets coarse gain of DAC A(B) full scale current. Range is 0 to 15. See the
Gain:
DAC5687 data sheet for full scale gain equation.
⋅
DAC Fine
Sets fine gain of DAC A(B) full scale current. Range is -128 to 127. See the
Gain:
DAC5687 data sheet for full scale gain equation.
⋅
DAC DC
Sets DAC A(B) DC offset register. Range is -4096 to 4095.
Offset:
⋅
Sleep:
DAC A(B) sleeps when set, operational when cleared.
⋅
NCO DDS:
Sets NCO DDS registers. See the DAC5687 data sheet for formula.
⋅
NCO Phase: Sets initial NCO phase registers. See the DAC5687 data sheet for more
information.
⋅
Pll Port
Selection of this button will bring up a separate window that shows the
Config:
parallel port configuration of the software. The EVM Menu should be
loaded with DAC EVM. This button also allows the user to change the LPT
address used by the PC. This is set by entering a valid address inside the
box labeled "LPT Address". The default setting is 378.
⋅
Quit:
Quits the operation of the DAC5687 software.
⋅
Version:
Displays the version of the silicon. If a version of 0 is read then the
communication is not functioning and an error message will be displayed.
⋅
About:
Opens an additional window with help related topics for the software.
This chapter describes the physical characteristics and PCB layout of the EVM and lists the components
used on the module.
16
DAC5687 EVM
SLWU017B – APRIL 2005 – Revised March 2007
